US4732369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arc apparatus for producing ultrafine particles
Assignee: Hitachi Ltd
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Filing: 1986-08-21
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Granted: 1988-03-22
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Expires: 2006-08-21
Abstract
Abstract An apparatus for producing ultrafine particles by arc energy characterized by disposing an electrode inclinedly as to a base material so as to generate a magnetic blow to arc, disposing a suction opening at the direction of the arc blown, and cooling vapors generated, followed by collection thereof can improve the production efficiency of ultrafine particles with a uniform particle size.
Inventors
- 👤 Takeshi Araya
- 👤 Yoshiro Ibaraki
- 👤 Yoshishige Endo
- 👤 Susumu Hioki
- 👤 Masatoshi Kanamaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:46
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/14; C; C04; C04B; C04B35/00; C04B35/622; C04B35/626
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
132 words
An apparatus for producing ultrafine particles of metals, alloys or ceramics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, an electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that the electrode is disposed inclinedly as to the base material so as to produce magnetic blow to the arc, the suction opening is positioned at the direction of the arc blown, and a cooling-gas feeder is positioned near the arc.
Claim 2
Independent Claim
132 words
An apparatus for producing ultrafine particles of metals, alloys or ceramics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, an electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that the electrode is disposed inclinedly as to the base material so as to produce magnetic blow to the arc, the suction opening is positioned at the direction of the arc blown, and a cooling-gas feeder is positioned near the arc.
Claim 3
Dependent Claim
15 words
An apparatus according to claim 1, wherein the cooling-gas feeder is positioned around the arc.
Claim 4
Dependent Claim
19 words
An apparatus according to claim 1, wherein the cooling-gas feeder is positioned between the arc and the suction opening.
Claim 5
Dependent Claim
25 words
An apparatus according to claim 2, wherein the electrode is inclined at an angle of 10° to 50° regarding a horizontal line of base material.
Claim 6
Dependent Claim
22 words
An apparatus according to claim 2, wherein a pulse current of 50 Hz to 20 kHz is used as an arc current.
Claim 7
Dependent Claim
24 words
An apparatus according to claim 2, wherein a heat source for revaporizing the ultrafine particles is placed between the suction opening and the cooler.
Claim 8
Dependent Claim
25 words
An apparatus according to claim 3, wherein the electrode is inclined at an angle of 10° to 50° regarding a horizontal line of base material.
Claim 9
Dependent Claim
22 words
An apparatus according to claim 3, wherein a pulse current of 50 Hz to 20 kHz is used as an arc current.
Claim 10
Dependent Claim
24 words
An apparatus according to claim 3, wherein a heat source for revaporizing the ultrafine particles is placed between the suction opening and the cooler.
Claim 11
Independent Claim
166 words
An apparatus for producing ultrafine particles of metals, alloys or cermics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, at least one electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that: the at least one electrode includes an electrode for generating a plasma arc and disposed inclinedly as to the base material so as to produce magnetic blow to the arc, and another arc discharge electrode disposed opposite to the base material so as to generate a gas tungsten arc in addition to the electrode for generating a plasma arc; and the suction opening is positioned at the direction of the arc blown.
Claim 12
Independent Claim
166 words
An apparatus for producing ultrafine particles of metals, alloys or cermics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, at least one electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that: the at least one electrode includes an electrode for generating a plasma arc and disposed inclinedly as to the base material so as to produce magnetic blow to the arc, and another arc discharge electrode disposed opposite to the base material so as to generate a gas tungsten arc in addition to the electrode for generating a plasma arc; and the suction opening is positioned at the direction of the arc blown.
Claim 13
Dependent Claim
28 words
An apparatus according to claim 10, wherein the arc is generated between the electrode for generating a plasma arc and the electrode for generating a gas tungsten arc.
Claim 14
Dependent Claim
41 words
An apparatus according to claim 10, wherein the arc is generated between the electrode for generating a plasma arc and the electrode for generating a gas tungsten arc, and between the electrode for generating a plasma arc and the base material.
Claim 15
Independent Claim
167 words
An apparatus for producing ultrafine particles of metals, alloys or ceramics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, an electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that the electrode is disposed inclinedly as to the base material so as to produce magnetic blow to the arc, the suction opening is positioned at the direction of the arc blown so as to suck a generated vapor, and the base material is obtained by melting a raw material in a gas atmosphere containing oxygen or by adding an element for increasing surface tension of a molten metal according to an increase of metal temperature.
Claim 16
Independent Claim
167 words
An apparatus for producing ultrafine particles of metals, alloys or ceramics by using arc energy comprising a generating chamber for generating ultrafine particles of metals, alloys or ceramics, an electrode positioned opposite to a base material for producing ultrafine particles so as to generate an electric arc, a suction opening for sucking the ultrafine particles generated in the generating chamber, a trap for collecting the ultrafine particles sucked from the suction opening, and a cooler positioned between the suction opening and the trap for cooling the sucked ultrafine particles, characterized in that the electrode is disposed inclinedly as to the base material so as to produce magnetic blow to the arc, the suction opening is positioned at the direction of the arc blown so as to suck a generated vapor, and the base material is obtained by melting a raw material in a gas atmosphere containing oxygen or by adding an element for increasing surface tension of a molten metal according to an increase of metal temperature.
Claim 17
Dependent Claim
25 words
An apparatus according to claim 10, wherein the electrode for generating a gas tungsten arc is disposed at a vertical position within the generating chamber.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-22 | 1991-09-21 | 1992-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-22 | 1995-09-21 | 1996-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-22 | 1999-09-21 | 2000-03-22 | $7700.00 | Window Closed / Lapsed |